Join Date: Apr 2003
Location: Mid-Hudson Valley, New York
For top-ups, I have added a gallon or less to a 20g tank untreated. I will rest the water overnight if I can, or add it unrested in this small an amount.
For a wc, I always dechlorinate. Most are 50% or better, the local water is treaed with chlorine, not chloramine, and for the last 2 years I have used sodium thiosulfate to dechlor. I use Rex's method of adding it directly to the tank, enough to do the entire volume. No problems to date.